Today's Message Index:
----------------------
1. 07:29 AM - Regulators (Bob McDevitt)
2. 08:01 AM - Re: A123 Systems Nano-phosphate technology (Robert L. Nuckolls, III)
3. 12:09 PM - Re: Transponder constantly replies (Pete Howell)
4. 03:09 PM - Re: spade lug failure. (sarg314)
5. 06:12 PM - test (Robert L. Nuckolls, III)
6. 07:14 PM - Schematic drawing software (B Tomm)
7. 08:06 PM - Low voltage indicator (paul wilson)
8. 09:06 PM - Re: Schematic drawing software (Robert L. Nuckolls, III)
9. 09:09 PM - Re: Low voltage indicator (Robert L. Nuckolls, III)
Message 1
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I have a question for Bob and the list in general.
Zeftronics, a large supplier of voltage regulators makes over a dozen
different numbered units, all designated for use with different aircraft
and aero engines. How different are these units from one another (other
than the obvious 14v and 28v units)
Message 2
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| Subject: | Re: A123 Systems Nano-phosphate technology |
At 01:32 PM 9/7/2007 -0600, you wrote:
>
>Whomever is designing the electronics doesn't have real experience with
>A123 Systems cells. They think they are dealing with conventional Li-Ion
>cells, and they are wrong.
>
> A123 Systems nano-phosphate cells are quite different than other
> Li-Ion cells. They will take a LOT of abuse. About the same amount as an
> AGM. It is straightforward to make a drop-in replacement for a 12 volt
> (or 24 volt) lead-acid battery using A123 Systems cells. The existing
> charging system will work just fine. (It must have the voltage set
> somewhere between 13.5 and 14.8 volts.)
Agreed, they are quite rugged compared to other devices
of this class . . . but as you've just noted one "must"
place some constraints on other features in the system
that do not already exist to support the legacy
battery technologies.
> In an airplane, you would want a warning that alerted the pilot that
> the system was going over 14.8 volts and would make noise if the system
> was going over 15 volts. It would also be useful to know if the battery
> temperature was going over 80 Celsius. (You can go up to about 100 C
> without damage, but no higher or you risk venting the cells and damaging
> the plastic separator.)
>
>
<snip>
> If you overcharge them grossly, they will vent a small amount of
> flammable vapor (like paint thinner.) If there is an ignition source,
> this vapor could catch fire. The cells can also burst if overcharged
> severely. That is the extent of the hazard this technology presents.
>
>Bill Dube'
To be sure, these cells are one of the bright stars on
the horizon . . . but they come with a legacy of unhappy
stories, myths and concerns. There is a great deal of work
to be accomplished before the FAA is going to "feel" comfortable
with putting this product on a TC aircraft. Since the FAA's
general level of expertise is less than stellar, the task
of the competent system integrator has as much to do with
the politics of assuaging feelings as with the development
of the science and good practice.
Believe me, by the time my principal (and the Navy's battery
labs in Crane, IN) get done with these cells, far more will
be known about them than what's presently published. Further,
it's almost a given that the successful, TC'd replacement
batteries in Li-Ion technologies will not be simple
substitutes of SVLA or NiCad cells.
Bob . . .
Message 3
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| Subject: | Re: Transponder constantly replies |
I found the cause for the runaway transponder. This summer, I switched the
top plugs in my O-320 RV-9A with electronic ignition from std BR8ES auto
plugs to the iridium style auto plug. I received an off list message
telling to look at the ignition system - sure enough the plug change matched
up with the tpx issue time frame.
Put in new plugs all around last night and things appear to be back to
normal.
Cheers,
Pete
Message 4
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| Subject: | Re: spade lug failure. |
I didn't get any responses to this, but I found an explanation for it
that I thought I should post. After carefully examining the bad female
lug, I noticed that it was of a different design than all the others.
It had had the same plastic insulating shrowd on it, but the metal
connector itself was different. I could not find one like it in all my
parts bins. I was also unable to duplicate the problem by crimping a
dozen test connectors trying to make every mistake I could think of.
So, I'm concluding that it was one of a different design that the
manufacturer or seller (Allied Electronics) got into the wrong parts bag
by mistake. It is probably designed for a different crimping tool and
the one I have crimped it differently and caused bad results. I have
yet to check all the connectors in the plane to verify that there were
no others like it that got installed. But I think my crimper is OK and
my connectors are OK too. Testing of the electrical system is going well.
sarg314 wrote:
>
> Using a dremel tool, I removed the plastic covering and part of the
> crimp. A little bit of the insulation extended into the part of the
> barrel that crimps the copper wire. Apparently what happened was that
> the act of crimping it cut thru the wire, but NOT thru the
> insulation. The connector was held on by the insulation. That tefzel
> is pretty tough stuff.
> --
> Tom Sargent, RV-6A
--
Tom Sargent, RV-6A, electrical system
Message 5
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I had to change the e-mail address dedicated to this
list-server. I have been getting a modicum of spam for
years but in the past few days, it turned into a torrent.
Note that messages directly to me should now be directed to
the address in the header of this message.
Bob . . .
----------------------------------------
( "Physics is like sex: sure, it may )
( give some practical results, but )
( that's not why we do it." )
( )
( Richard P. Feynman )
----------------------------------------
Message 6
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| Subject: | Schematic drawing software |
Bob
Do you have a suggestion for inexpensive software to draw/modify/print
electrical wiring diagrams for our planes?
Thanks
Bevan
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Sunday, September 09, 2007 7:14 PM
Subject: AeroElectric-List: test
--> <nuckolls.bob@cox.net>
I had to change the e-mail address dedicated to this list-server. I have
been getting a modicum of spam for years but in the past few days, it turned
into a torrent.
Note that messages directly to me should now be directed to the address in
the header of this message.
Bob . . .
----------------------------------------
( "Physics is like sex: sure, it may )
( give some practical results, but )
( that's not why we do it." )
( )
( Richard P. Feynman )
----------------------------------------
Message 7
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| Subject: | Low voltage indicator |
Anybody know of a DIY kit similar to what Bob shows in his data base?
Bob doesn't show his kit available now.
Thanks, Paul
Message 8
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| Subject: | Re: Schematic drawing software |
At 07:12 PM 9/9/2007 -0700, you wrote:
>
>Bob
>
>Do you have a suggestion for inexpensive software to draw/modify/print
>electrical wiring diagrams for our planes?
TurboCAD 7 or higher will open, edit, print and save the drawing
files posted on my website at:
http://www.aeroelectric.com/PPS/
You can get TurboCAD off ebay for under $20. Your wiring diagrams
are 90% done on the website. Just grab the pages closest to what
you want and suck them into your own wirebook.
Bob . . .
Message 9
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| Subject: | Re: Low voltage indicator |
At 09:04 PM 9/9/2007 -0600, you wrote:
>
>Anybody know of a DIY kit similar to what Bob shows in his data base?
>Bob doesn't show his kit available now.
I've sold out of the older board. The short-kit is coming
back but this time it will include an enclosure like:
http://www.aeroelectric.com/Pictures/Products/Enclosures/A15_Package.jpg
You'll get the board and enclosure with a pre-punched hole
in the lid. I've been fussing with it for some time but my
consulting task that started out as a 20hr/wk commitment
has exploded into a 40+ effort . . . but hopefully for a short
time until they hire some more folks and we get our organization
here in Wichita put together.
The new board layout is done, I just need to update the assembly
instructions.
Bob . . .
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